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SimApplication

CVE-2026-3431

CRITICAL · 9.8 CVSS v3.1 Published 2026-03-02
Fix available
A fix is available. Upgrade to 0.5.74 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
On SimStudio version below to 0.5.74, the MongoDB tool endpoints accept arbitrary connection parameters from the caller without authentication or host restrictions. An attacker can leverage these endpoints to connect to any reachable MongoDB instance and perform unauthorized operations including reading, modifying, and deleting data.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

SimStudio versions below 0.5.74 have MongoDB tool endpoints that accept arbitrary connection parameters from unauthenticated callers without any host restrictions. This allows attackers to instruct the vulnerable system to connect to any reachable MongoDB instance and perform unauthorized read, write, and delete operations.

MitigationUpgrade SimStudio to version 0.5.74 or later which should implement proper authentication and host validation for MongoDB tool endpoints. Additionally, apply network segmentation to restrict which MongoDB instances the application can reach.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
SimApplication
Affected:< 0.5.74

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify SimStudio installation and version
    Locate the SimStudio application and check its version number. This is typically found in the application metadata, about screen, or installation directory. Compare your version against the affected range: < 0.5.74
    Affected if The installed version is below 0.5.74
  2. Verify MongoDB tool feature is in use
    Determine if the MongoDB tool endpoints are enabled or configured in your SimStudio installation. Check application configuration files or settings for MongoDB-related modules or endpoints
    Affected if MongoDB tool endpoints are enabled or configured in your environment
  3. Confirm lack of authentication on MongoDB endpoints
    Review the MongoDB tool endpoint configuration or code to verify whether authentication is required. Check for any authentication mechanisms or token validation on requests to these endpoints
    Affected if MongoDB tool endpoints allow requests without requiring authentication
  4. Check for host allow-listing restrictions
    Inspect the MongoDB tool endpoint configuration to see if there are any host restrictions or allow-listing rules that limit which MongoDB instances can be connected to
    Affected if No host allow-listing or IP restrictions are configured for the MongoDB tool endpoints
  5. Assess network exposure of MongoDB instances
    Determine if your SimStudio server can reach other MongoDB instances on the network. Check firewall rules and network segmentation around the SimStudio host
    Affected if The SimStudio server can reach other MongoDB instances on the network without restrictions

You are affected if SimStudio version is below 0.5.74 AND the MongoDB tool feature is enabled AND the endpoints lack authentication AND there are no host restrictions AND the server has network access to MongoDB instances

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 0.5.74 or later
Fixed in 0.5.74
Interim mitigation

Upgrade SimStudio to version 0.5.74 or later which should implement proper authentication and host validation for MongoDB tool endpoints. Additionally, apply network segmentation to restrict which MongoDB instances the application can reach.

Recommended fix High confidence

0.5.74

  1. Backup your current Sim installation and any associated configuration files
  2. Upgrade Sim to version 0.5.74 or later
  3. After upgrading, verify that the MongoDB tool endpoints now properly enforce authorization controls
  4. Test that legitimate MongoDB connections work correctly with proper authentication

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Sim Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-3431 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data